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Space. Space is a three-dimensional continuum containing positions and directions. [1] In classical physics, physical space is often conceived in three linear dimensions. Modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. [2]
Outer space. Illustration of Earth's atmosphere gradual transition into outer space. Outer space (or simply space) is the expanse beyond celestial bodies and their atmospheres. It contains ultra-low levels of particle densities, constituting a near-perfect vacuum [1] of predominantly hydrogen and helium plasma, permeated by electromagnetic ...
The universe is all of space and time [a] and their contents. [10] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of energy and matter, and the structures they form, from sub-atomic particles to entire galaxies. Space and time, according to the prevailing cosmological ...
The principal component of the Solar System is the Sun, a low-mass star [g] that contains 99.86% of the system's known mass and dominates it gravitationally. [26] The Sun's four largest orbiting bodies, the giant planets, account for 99% of the remaining mass, with Jupiter and Saturn together comprising more than 90%.
A black hole is a region of spacetime where gravity is so strong that nothing, including light and other electromagnetic waves, is capable of possessing enough energy to escape it. [2] Einstein 's theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
The International Space Station(ISS) is a large space stationassembledand maintained in low Earth orbitby a collaboration of five space agencies: NASA(United States), Roscosmos(Russia), JAXA(Japan), ESA(Europe), CSA(Canada), and their contractors. ISS is the largest space station ever built. Its primary purpose is performing microgravityand ...
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